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Aiming at the development of Si3N4 based ceramics with low frictional coefficient, Fe5Si3-particles-dispersed Si3N4 ceramics were fabricated from a mixture of powders containing Fe3O4, Si3N4 and sintering additives. Microstructure, frictional and mechanical properties were investigated of the obtained ceramics, and it was confirmed that Fe3O4 consumed and granular Fe5Si3 phase generated with in the Si3N4 matrix by the reaction of Fe3O4 with other components during sintering. Sintered bodies were densified and high strength of 900MPa was obtained, when the amount of Fe3O4 addition was less than 10mass%. Whereas Fe3O4 addition exceeded 20mass%, the strength fell off remarkably due to agglomerated Fe5Si3 and big pores. Moreover, the 10mass% Fe3O4 added Si3N4 showed the lowest frictional coefficient. According to data of heat of immersion and contact angle measurement, this result was interpreted as being provided by the lubricant film formed on the ceramic surface.

Frictional and Mechanical Properties of Fe5Si3-Particles-Dispersed Si3N4 Formed by the Reaction during Sintering.